Blockchain is a secure digital ledger that records transactions across multiple computers, making data nearly impossible to alter or hack. Think of it as a shared notebook that everyone can see but no one can erase. Originally created for cryptocurrencies like Bitcoin, blockchain now powers everything from supply chain tracking to digital contracts. For career changers, this technology opens doors in finance, healthcare, logistics, and tech. You don't need a computer science degree to start – many roles focus on strategy, analysis, and implementation rather than coding.
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